Fixes another 100% CPU spin bug, improves low latency mode, fixes some
crashes on stopping stream due to race conditions.

The LGP issue is caused by the device drivers returning two or more
packets in a single segment of audio data.  This fixes it by detecting
that and decoding subsequent packets.

When the FFmpeg audio decoder returns, it returns how many bytes of data
was decoded.  To have it decode multiple packets in a single segment,
just subtract the return value from the expected size, and if that size
is still larger than zero, then there are more packets in the segment to
decode.  Otherwise, stop.

This reverts commit 32f60d07.

VST: Fix crash when OBS is set to mono

VST: Fix save / load of plugin state. More interface options.

Fixed an incorrect call when setting the chunks on plugins.

Added the ability to to enable having a plugin auto open when active.

CI: OSX - Move CEF version to .travis

CI: Fix cef version variable

CI: OSX - export cef version so we can use it elsewhere

UI: Don't exit on unknown command line arguments

OBS Browser Source uses command line arguments for flags. Exiting on
command line arguments that are unknown to OBS prevent's that
functionality from working.

CI: OSX - Use bash variable for CEF version

CI: OSX - Update to CEF 2987

enc-amf: Update to 1.4.3.11

Thanks to @notr1ch for the PR and for the guy on Forums reporting the Simple Mode problem.

CI: OSX - Include branch in pkg

CI: Deploy on tags and master branch

CI: Add boolean arg parser to OSX

CI: Fix true / false on stable builds